I like the photo and I'd pick the Coffee about now ;-). Anyways, good work on this however I find that the background has good lighting yet the subject (in my view) doesn't have enough lighting on it. If it was the other way around you would have had a great photo in my opinion. Keep shooting!
I think I understand your choice for this exposure. While it adds to the message I take from this photograph, I had to overcome a strong negative first impression in order to see the message.
to me, pgotography is primarily about light. this one could either use a little more or a little less, depending on what you're going for. I really like the backlighting idea using the firbeglass wall (a shed or barn I'd assume), but the cannisters seem like they need to either be brought out a bit, or completely silhouetted. A single spot light cast from the direction of your camera would help i think. if this weren't a basic challenge, you could dodge the cannisters a bit and just bring out the highlights a wee bit. This is just my opinnion of course - ignore it if this is the look you're going for :) 6 from me.
I like the texture on the wall. I would have liked the photo better if there had been some light on the jars. Also, the composition doesn't seem balanced, but I'm not expert. 6